An immobilizer for blood vessels including multiple grooves on the bottom surface of a clear, flexible length of a plastic material, arranged in parallel to each other and perpendicular to the length of the plastic material. The grooves are of varying sizes to accommodate the differing diameters of veins...http://www.google.es/patents/US5415647?utm_source=gb-gplus-sharePatente US5415647 - Flexible, multi-grooved vascular immobilizer
